Signal-cock.



No. 649,297. Patent ed May 8, I900.

B. J. GRAHAM.

SIGNAL cock (Application filed Nov. 1, 1899.)

(No Model.)

"H. I m in UNrrEn STATES PATENT OFFICE.

BENJAMIN J. GRAHAM, OF BOSTON, MASSACHUSETTS, ASSIGNOR, BY DIRECT AND MESNE ASSIGNMENTS, OF TlVO-THIRDS TO CHARLES IV. SIIERBURNE,

OF SAME PLACE, AND FRANCIS A.

SETTS.

BARBEY, OF CAMBRIDGE, MASSACIIIL SIG NAL-COCK.

SPECIFICATION forming part of Letters Patent No. 649,297, dated May 8, 1900.

Application filed November 1, 1899. Serial No. 735,465. (No model.)

To all 1071,0111, it may concern:

Be it known that I, BENJAMIN J. GRAHAM, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Signal-Cocks, of

which the following is a specification.

This invention relates to cocks such as are used in the couplings con uecting the air-brake pipes of a train of cars.

The object of the invention is to provide a cock having a plug-operating handle or lever adapted to serve also as a whistle, o that the cock maybe used as a signal or alarm when, for example, a train of cars is moving backward and it is desired to warn a person n the track, this being accomplished by adjusting the cook-plu g so that compressed air from the brake system will be liberated through the plug-operating arm or handle, th s unding the whistle with which said arm is provided.

Of the accompanying drawings, forming a part of this specification, Figure 1 represents a plan view of a signal-plug cock embodying my invention. Fig. 2 represents a section lengthwise of Fig. 1 and through the center thereof. Fig. 3 represents a section on line 3 3 of Fig. 2. Fig. 4 represents a side view of the plug and a part of its operating-arm.

The same letters and numerals of reference indicate the same parts in all the figures.

In the drawings, a represents the casing of a plug-cock, having the inlet 2 and the outlet 3, said inletand outlet being adapted for connection with suitable pipes or conduits.

1) represents the plug, which is formed to close the passage through the casing and has a main port 4,which connects the inlet 2 with the outlet 3 when the plug is in its open position. To the plug is aflixed an operating arm or handle 0, by which theplug may be turned to open and close it. The arm 0 is here shown as provided with a fluid-duct 5 and with a sharp edge 6, forming one side of a chamber 7, to which fluid is delivered by plug 1) is provided with a whistle-port 8,which when the plug is in the position shown in Fig. 3 communicates with theinlet 2 of the casing.

the duct 5, the whole forming a whistle. The- The said whistle-port communicates with the fluid-duct 5, preferably through the main port 4-, into which said d not and the whistleport open.

It will be seen that when the plug is in the position shown in Fig. 3 it closes the passage through the casing and at the same time permits fluid from the inlet end of the casing to pass through the whistle, thus sounding the latter. The form and arrangement of the whistle-port are such that when the plug is turned to bring the main port 4 at right angles with the passage through the casing or thereabout the whistle-port will be shut oil from the inlet, so that there will be no operation of the whistle. When the plug is opened, the fluid-pressure will escape through the outlet of the casing to such an extent that it will not operate the whistle.

It will be seen that if the described signalcock be used in an air-pipe at the rear end of a train of cars when the train is backing it can be readily adjusted to give an alarm or warning to a person walking on the track.

The above-described signal-cock is intended to be used onlyat the rear end of a train, where it is attached to the end of the trainpipe hose, the valve at the end of said hosecoupling being then opened. the signal-cock may be brought into a more convenient position for operation by the brakeman, a short section of pipe may be interposed between the coupling at the end of the train-pipe hose and the casing a of the sig nal-cock, said short section of pipe being detachably connected by any suitable means with the railing of the rear platform. When the plug is turned to the position shown in Fig. 3, it permits of the passage of only sufficient fluid to sound the whistle without reducing the pressure in the train-line sufficiently to operate the brakes; but when the plug 1) is turned so as to open a free communication between the ports 2 and 3 the brakes will be operated without sounding the whistle.

I do not limit myself to the details of construction nor to the particular form of whistle here shown. The signal may be operated by In order that 2. A signal-cock comprising a casing, a plug having a whistle-port, an operating arm or le- Ver attached to the plug and provided with a whistle, and a fluid-conduit connecting the whistle-port with the whistle.

In testimony whereof I have affixed my signature in presence of two witnesses.

BENJAMIN J. GRAHAM.

Witnesses:

O. F. BROWN, A. D. HARRISON. 

